Help in libgcc for the assembly code generation

[nitin jain <nitin_mbm at yahoo dot com>]

Dear All,
                                                      
                                                      
               
I added a new Back-end in the GCC. After configuring
GCC for this
Back-end, generated assembly code or intermediate code
gives some
problem.
                                                      
                                                      
               
This is a C Program.
-----------------------------------------------------------------------
int main(void)
{
    int i,j;
    j=0;
    i=8;
    if(j)
        goto nitinj;
    j=i<222;
nitinj:
    return j;
}
-------------------------------------------------------------------------
                                                      
                                                      
               
This is a part of RTL code.
-------------------------------------------------------------------------
(insn 40 39 41 (set (reg/f:SI 0 ret [35])
               (reg/f:SI 0 ret [34])) 1 {*movsi_1}
(nil)
               (nil))
                                                      
                                                      
               
(insn 41 40 42 (set (mem:SI (reg/f:SI 0 ret [35]) [0
S4 A32])
               (const_int 221 [0xdd])) 1 {*movsi_1}
(nil)
               (nil))(call_insn/u 42 41 44 (set
(reg:SI 0 ret)
             (call (mem:QI (symbol_ref:SI
("__cmpsi2")) [0 S1 A8])
             (const_int 8 [0x8]))) 4 {call_value}
(nil)
             (expr_list:REG_EH_REGION (const_int -1
[0xffffffff])
             (nil))
             (expr_list (clobber (reg/f:SI 10 sp))
             (nil)))
                                                      
                                                      
               
(insn 44 42 45 (set (reg:SI 0 ret [37])
               (reg:SI 0 ret)) 1 {*movsi_1} (nil)
               (nil))
                                                      
                                                      
               
(insn 45 44 46 (set (cc0)
               (compare (reg:SI 0 ret [37])
               (const_int 1 [0x1]))) 8 {*cmpsi_1}
(nil)
               (nil))
                                                      
                                                      
               
-------------------------------------------------------------------------
                                                      
                                                      
               
My problem is that why there is a call to "__cmpsi2"
while there is no
such thing in my .md file.
                                                      
                                                      
               
The part of the .md which is for `cmp op'.
                                                      
                                                      
               
-----------------------------------------------------------------------
                                                      
                                                      
               
( define_expand "cmpsi"
  [(set (cc0) (compare (match_operand:SI 0
"general_operand" "")
                       (match_operand:SI 1
"general_operand" "")))]
   ""
   "")
                                                      
                                                      
               
( define_insn "*cmpsi_1"
  [(set (cc0) (compare (match_operand:SI 0
"cmp_dest_op" "")(match_operand:SI 1 "cmp_src_op"
"i")))]

""
                  "*
     toy_cmp_insn (operands[0], operands[1]);
   ")
                                                      
                                                      
               
`cmp_dest_op' checks that operand should be a memory
or reg while
`cmp_src_op' checks that operand should be a
const_int.
                                                      
                                                      
               
-----------------------------------------------------------------------
                                                      
                                                      
               
I got some information that this is because of the
default library
functions provided by GCC as `libgcc1.a'. I don't know
how to disable the
calling of such function in the assembly code
generation process.
                                                      
                                                      
               
Please give me some suggestion.
                                                      
                                                      
               
Thanks a lot.
                                                      
                                                      
               
Nitin
---------------------------
Nitin Jain (H-12/#A-415)
Computer Science and Engg,
IIT BOMBAY,
POWAI, MUMBAI 400076
Phone : 4748 (Lab)
---------------------------
                                                      
                                                      
               
                                                      
                                                      
            




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